body{
	margin: 0;
	padding: 0;
	background: url(../images/83.jpg) no-repeat;
	background-size: 100%;
}
.content{
	width: 45%;
	height: 1000px;
	background-color: #fff;
	margin: 0 auto;
}
.tab_1{
	width: 90%;
	margin: 0 auto;
}
.tit{
	height: 30px;
	width: 90%;
	background-color:lightyellow; 
	line-height: 30px;
	text-align: center;
	border: 1px solid #000;
	border-left: none;
	border-right: none;
	margin: 0 auto;
}
table{
	border:1px solid #ccc;
	border-collapse: collapse;
}
.tab_1 tr td{
	border:1px solid #ccc;
	font-size: 14px;
	letter-spacing: 0.1rem;
	padding: 3px;
}
.tab_1 td:nth-child(1),.tab_1 td:nth-child(3){
	width: 20%;
}
.tab_1 td:nth-child(2),.tab_1 td:nth-child(4){
	width: 30%;
}